Hiram Augustus Unruh (November 1, 1845 – December 16, 1916) was a Union Army soldier from Indiana who became a prominent businessman in California.

After being released on parole and then exchanged for a Confederate prisoner, he reenlisted with the 1st United States Marine Artillery Volunteers.

[4] After the war, he studied telegraphy, and worked for Western Union, Wells Fargo, and for Central Pacific Railroad crews building telegraph lines in California.

He became the executor of his substantial estate after Baldwin's death in 1909, making investments which earned large returns for his heirs.

[5] Hiram A. Unruh died while returning from an automobile trip to Arcadia, California from Los Angeles.